Coordinated disturbances haunt grids worldwide. Here’s how researchers solved the mystery. — Live Feedhttps://www.live-feeds.com/feed/coordinated-disturbances-haunt-grids-worldwide-here-s-how-researchers-solved-the-mysteryContinuously updated, source-cited coverage. Researchers trace global grid frequency dips to synchronized UPS battery self-testshttps://www.live-feeds.com/feed/coordinated-disturbances-haunt-grids-worldwide-here-s-how-researchers-solved-the-mysteryhttps://www.live-feeds.com/feed/coordinated-disturbances-haunt-grids-worldwide-here-s-how-researchers-solved-the-mystery#u195519Thu, 12 Nov 2026 01:31:06 +0000A German research team has identified the source of mysterious minute-by-minute frequency drops observed on power grids across five continents for over a decade. The disturbances stem from synchronized battery state-of-charge checks performed by uninterruptible power supply (UPS) systems. These automated self-tests, often scheduled at the top of the hour, create coordinated load changes large enough to perturb grid frequency worldwide. Researchers recommend randomizing test schedules to eliminate the synchronized heartbeat and reduce blackout risk.Why it mattersGrid operators have long detecte